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| Performance Analysis of a Novel CRMA Protocol
Based on Runtime Optimization |
| He Hong; Li Jian-dong; Sheng Min |
| State Key Lab. of Integrated Service Networks, Information Science Institute, Xidian Univ., Xi’an 710071, China |
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Abstract To improve the Binary Exponential Backoff algorithm (BEB)’s channel throughput of IEEE 802.11 protocol, a novel Collision Reduced Multiple Access protocol (CRMA) is proposed based on slow contention window decrease mechanism and runtime optimization method. By integrating slow CW decrease scheme with runtime optimization mechanism to effectively solve no state information indicating the actual contention level of BEB algorithm after a successful transmission, CRMA protocol can record the current backoff stage of the latest successful transmission under the overload network precisely. As a result, it decreases the collision times and improve the channel utilization. The CRMA protocol could be compatible completely with pre-existed IEEE 802.11 protocol, and it is represented by its simplicity, integrability, complete distribution and adaptiveness. The performance analysis and numerical results show that its performance is much better than the IEEE 802.11 protocol and other recent multiple access mechanisms because of the accurate estimation of congested level before transmission and the effective record of backoff stage after a successive transmission.
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Received: 10 September 2004
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2006, Vol. 28 
